Mobilized lifting and loading boom



y 1, 1962 s. s. MCINTYRE, SR 3,032,206

MOBILIZED LIFTING AND LOADING BOOM Filed Feb. 23, 1960 5 Sheets-Sheet 1 f INVENTOR. SIQNEYS M L /NTYRE, .52.

147'7'0RNW y 1962 s. s. MOINTYRE, SR 3,032,206

MOBILIZED LIFTING AND LOADING BOOM Filed Feb. 25, 1960 3 Sheets-Sheet 5 \J IN V EN TOR. 73 SIDNEY k5. N /NTYRQLS R- United States atent @hfice 3,032,205 Patented May I, 1962 3,032,206 MOBILIZED LHFTING AND LOADING BOOM Sidney S. McIntyre, I., Sedro Woolley, Wash, assignor to The Humboldt Company, Seattle, Wash. Filed Feb. 23, 1960, Ser. No. 10,448 4 Claims. (Cl. 212-35) This invention relates to mobilized lifting and loading apparatus and it has reference more particularly to apparatus having a lifting and loading boom, mounted on an automotive truck for the lifting and loading of heavy objects onto or from the same; the present invention being in the nature of an improvement upon the loading vehicle shown in United States Patent No. 2,895,622, issued to A. E. Sundin on July 21, 1959, which discloses use on a truck bed, of a boom that is swingable in a horizontal and vertical direction relative to its supporting jack or standard; said boom being equipped at its outer end with an extension lever arm pivoted thereto for swinging in the vertical plane of the boom from an extended loading position to an inactive position directed inwardly and along the top side of the boom.

It is the principal object of the present invention to provide an apparatus of the above stated character wherein the means employed for effecting the swinging adjustment of the extension lever arm is simplified; safer in use; less expensive to manufacture and is more positive in its action than in prior devices of this character.

It is a further object of the present invention to provide a rack and pinion mechanism in connection with a double acting hydraulic cylinder for the positive actuation of the extension lever arm between its extended and inactive positions of adjustment.

Still further objects of the invention reside in the arrangement of parts used in the hydraulic system of control for the adjustment of the various movable parts.

In accomplishing the above mentioned and various other objects of the invention, I have provided the im proved details of construction, the preferred forms of which are illustrated in the accompanying drawings, wherein:

FIG. 1 is a rear end view of an automobile truck chassis on which a loading apparatus embodied by the present invention, is mounted; the extension lever arm of the boom being here shown as adjusted to a retracted position; this being herein designated as its inactive position.

FIG. 2 is a side view of the boom, as adjusted to a position of use, with the extension lever arm thereof adjusted to an extended position.

FIG. 3 is an enlarged sectional View, taken on line 3-3 in FIG. 1, showing the rack and pinion means for rotatably actuating the boom mounting standard to swing the boom in a horizontal arc.

FIG. 4 is a vertical section, taken substantially on line 4-4 in FIG. 8 showing the rotatable lower end mounting of the boom standard.

FIG. 5 is an enlarged, cross-sectional detail, taken on line 55 in FIG. 2.

FIG. 6 is an enlarged, cross-sectional detail, taken substantially on line 66 in FIG. 2.

FIG. 7 is a sectional detail, taken on line 77 in FIG. 6.

FIG. 8 is an end elevation of parts of the mechanism as seen looking through the plane of line 8-45 in FIG. 1.

FIG. 9 is a schematic showing of the hydraulic con trol system of this mechanism.

Referring more in detail to the drawings:

In FIG. 1, the automobile truck chassis is here shown to comprise opposite, side beams 10-10 supported on a cross-axle 11 which is equipped at its opposite ends with the usual sets of supporting wheels 12-12.

Mounted horizontally and transversely of the chassis, on the beams 1tl1tl, is a strong, cylindrical or tubular reservoir 15, with opposite end portions extending equally to opposite sides of the truck. This cylindrical reservoir is seated in and fixedly secured to saddles 16-16 which are, in turn, suitably bolted to the chassis beams 10--1tl, as is well shown in FIG. 8. At its opposite ends the cylinder 15 is closed by cover plates 15'--15 which mount vertically extended hydraulic jacks 17-17' thereon. These jacks have piston rods 18 that may be extended downwardly to ground contact to support the weight that is to be applied to the chassis and stabilize use of the boom.

Mounted upon the cylinder 15, in the central longitudinal plane of the truck, as shown in FIG. 1, is a vertical standard 19 which at its upper end mounts the present loading boom thereon. This boom 20 is a metal fabrication and is pivotally hinged at its inner end to the upper end of the standard 19 by a horizontal hinge pin 21, for vertical swinging adjustment at its outer end between the downwardly inclined position, in which it is shown in FIG. 1, and an upwardly directed position, as seen in FIG. 2. This boom is equipped at its outer end with an extension lever arm 23, mounted for vertical adjustment relative thereto from a position of use or extension, as shown in FIG. 2 to an inactive position, folded back along the top of the boom as shown in FIG. 1. It is to be observed, particularly by reference to FIG. 2, that the inner end of the extension lever arm 23 is equipped with an upwardly and angularly directed mounting arm portion 24 whereby the extension arm is pivotally mounted and whereby it will be caused to be disposed slightly above the line of the boom 20 when folded back to its position laid along the top of the boom as shown in FIG. 1. Both-the boom 20 and the exten sion lever arm 23 are of hollow form as indicated by their showing in FIG. 6. It is further to be understood that the hinge or pivot pin 21 whereby the lever arm 23 is mounted at the boom end, is keyed in the lever arm 24 against rotation, as has been shown at 27 in FIG. 6.

For the support of the extension lever 23 in any extended position of adjustment relative to the boom 20 and for its actuation to various angular positions of extension, I provide a hydraulic cylinder 30. This is pivotally mounted by a pivot pin 31 within and extends longitudinally of the boom, as shown in FIG. 2. The pivot pin 31 is tubular and is applied through the inner end head of the cylinder and a piston rod 32 extends from the outer end of the cylinder and is pivotally fixed at its outer end to the underside and lower end portion of the angular arm 24 by a pivot pin 33 as shown in FIG 2. The primary purpose of the hydraulic cylinder 30 is to effect the adjustment of the extension lever arm 23 to and hold it at various angular positions below the line of the boom 20.

For the purpose of swinging the extension lever 23 to a position folded back along the boom, as has been shown in FIG. 1, I have provided a hydraulic cylinder 44 that is fixedly mounted by and extends along a top side edge of the boom 20, as best shown in FIG. 2. This cylinder 40 has a piston rod 41 extended forwardly therefrom to a distance somewhat forwardly of the hinge pin 21. The outer end portion of this rod forms a gear toothed rack 41r which is held in operative mesh with a small diameter pinion gear 43 that is keyed to one end portion of the pivot pin 21, as shown in FIGS. 2, 6 and 7. Thus, with the retraction of the piston rod 41, the extension lever will be caused to swing from any downwardly and forwardly directed position of extension, upwardly and rearwardly to a position of substantial alignment with the boom. It is to be explained, however, that for any back folding adjustment of the lever arm 23, the pivot pin connection 33 with the piston rod 32, must be withdrawn. In order that an easy withdrawal of the pivot pin may be accomplished, it has, as shown in FIG. 5, been equipped at one end with a head 45 in which a pull ring 46 is secured, and at its other end 'is equipped to receive a locking 'pin or key 47 to retain the pin against accidental removal or displacement.

At its outer end the extension arm 23 is equipped with a hook, a securing latch or other means, as at '50 for holding a load lifting cable 51 or the like.

The tubular standard 19 which supports the boom 20 at its upper end, is rotatably mounted at its lower end for turing about a vertical post or stem 60 that is fixed rigidly and vertically upon the cylinder as has been shown best in FIG. 4. This post is mounted in bearings 616l' fitted in upper and lower walls of the cylinder 15, as shown. The tubular standard is formed with a ring gear 62 about its lower end portion and this end portion is enclosed by a housing 62x fixed to reservoir 15.

Supported horizontally and in interineshing contact with the gear 62, as seen in FIGS. 3 and 9, is a rack bar 63 that is contained longitudinally within a hydraulic cylinder 64 as shown best in FIG. 7. At its ends this rack bar is equipped with pistons 65-65 that are reciprocally fitted in cylinder 64. Adjustment of therack bar 63 in an endwise direction operates to rotatably adjust the standard 19 to swing the boom horizontally, as will presently be more fully explained. It has been shown in FIGS. 1 and 8 that the hydraulic cylinder 64 is fixed upon and extends along the hydraulic storage cylinder 15.

The vertical swinging of the boom 20 is under control of a hydraulic cylinder 70 that is pivoted at its lower end by a pivot pin 71 within the upper end portion of a laterally inclined extension of the standard. This cylinder has an extendable and retractable piston rod 72 that is pivoted by a vpivot pin '73 to the medial portion of the boom 20. Extension and retractionof this piston rod 72 effects the vertical swinging adjustment of the boom, as between positions of FIGS. 1 and 2.

The hydraulic control system for the operation of the various movable parts is as shown schematically in FIG. 9.

In this drawing, it is observed that the cylinder 15 serves as a storage tank for an adequate supply of hydraulic pressure medium M. A pump 85 operates to continuously draw pressure medium from the reservoir through a supply line 86 and deliver it under pressure through a pipe 87 to a valve mechanism designated in its entirety by 88 for delivery, selectively, therefrom to various points of use. This .valve mechanism comprises five separate and independently operable valves each receiving pressure medium from the pump. The separate valve mechanisms are designated in FIG. 9, respectively, by reference letters a, b, c, d and e and these valves are individually under control of levers, a, b, c, d and e, shown in FIG. '8. The hydraulic connections between the valves and parts they control is shown in FIG. 9 to comprise pressure lines 90 and 91 that lead from valves a and e, respectively, to the jacks -1717; a pressure line 92 that leads tothe lower end of cylinder 70; a pressure line 93 that leads from valve c to the right hand end of cylinder 64;.and a pressure line 94 that leads from valve d to the right hand end of cylinder 30. Valves a, b, and e are single acting while valves 0 and e are double acting, and therefore there are pressure lines 95 and .96 leading respectively from their upper ends to the right hand ends of cylinders 64 and 30. Note is also to be taken that cylinder 40 has no direct valve control but is connected at opposite ends by pressure lines 98 and 99 reversely with cylinder 30. Thus, the actuation of the extension lever arm 40,1is' incident to operation of the double acting cylinder 30.

Assuming then that the piston rod 32 has been previously disconnected from arm 23, and that the parts are disposed in the relationship as shown in FIG. 1, operation would be as follows: First, if desired or necessary, pressure medium is applied by setting of the valves a and e to extend the jacks 1717' into ground contact to support the weight of the load to be lifted. Then, valve b, is manipulated to apply pressure medium through pipe 92 to the lower end of cylinder 70 to lift the outer end of the boom clear of the vehicle body. If desired or required the valve c may then be adjusted to apply pressure. medium to one or the other end of cylinder 64 to move the rack bar 63 to rotatably adjust standard 19 for properly directing the boom. Then, by a controlled application of pressure medium, by manipulation of double acting valve d the piston rod 32 in piston 30 may be retracted to its inner limit of movement. This results then in the pressure medium, as applied through pressure line 96 to flow through pipe connection 99 into the left hand end of cylinder 40, as seen in FIG. 9, thus to push piston rod 41 outwardly and cause rack 41;- to act on gear 43 to bring the extension arm 23 outwardly and downwardly for the operative connection therewith of the piston rod 32 by pivot pin 33. With the operating connections thus made, the boom 26 may be swung vertically and horizontally. Also, the extension arm 23, then in position as in FIG. 2, may be swung vertically on pivot pin 21 by control of cylinder 36 independently of the boom cylinder 70 or in conjunction therewith. Horizontal swinging of the boom and load is controlled by rack bar 63 as contained in cylinder 64 under control of valve 0.

For this actuation of the valves, control rods extend horizontally from end to end of cylinder 15, and these are individually connected with actuating lever arms at their opposite ends as seen in FIG. 1 for selective manipulation of the valves a, b, c, d and e from opposite sides of the vehicle.

What I claim as new is:

l. A load lifting apparatus of the character described comprising a vertical standard, a boom hingedly interconnected at one end to the upper end of said standard, an extension arm hinged to and supported from the free end of said boom, a pivot pin interconnecting said boom and said extension arm, a first power cylinder connected at one end to said standard and connected at its other end to said boom, a second power cylinder connected at one end to said boom and releasably connected at its other end to said extension arm, a pinion gear mounted on said pivot pin, a third power cylinder mounted on the top of said boom, said third power cylinder including a piston rod extending fro-m one end thereof toward said pinion gear, a rack bar formed on the underside of said piston rod and said rack bar engaging in operative mesh with said pinion gear whereby the vertical swinging movement of said extension lever arm is controlled by the inward and outward extension of said piston rod.

2. A load lifting apparatus as in claim 1 including power means for rotating said standard.

3. A load lifting apparatus as in claim 1 including a laterally direct arm on the upperend of said standard and said first power cylinder is connected to the free end of said arm.

4. A load lifting apparatus as in claim 3 wherein 'said power cylinders and power means are all hydraulically actuated from a single source of hydraulic fluid.

References Cited in the file of this patent UNITED STATES PATENTS 2,895,622 Sundin July 21, 1959 FOREIGN PATENTS 204,736 Austria Aug. '10, 1959 

